Scott Atchley wrote:
> On Sep 25, 2008, at 10:19 AM, Joe Landman wrote:
>>> We have measured NFSoverRDMA speeds (on SDR IB at that) at 460 MB/s,
>> on an RDMA adapter reporting 750 MB/s (in a 4x PCIe slot, so ~860 MB/s
>> max is what we should expect for this). Faster IB hardware should
>> result in better performance, though you still have to walk through
>> the various software stacks, and they ... remove efficiency ... (nice
>> PC way to say that they slow things down a bit :( )
>> Joe,
>> Even though recent kernels allow rsize and wsize of 1 MB for TCP,
> RPCRDMA only supports 32 KB. This will limit your throughput some
> regardless of faster hardware.
I saw some messages to that effect a while ago (from you as I remember)
on another list.
10 or more Gb network, and the RDMA version lets you do a spoonful of
data at a time ... Do'h!
--
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: landman at scalableinformatics.com
web : http://www.scalableinformatics.comhttp://jackrabbit.scalableinformatics.com
phone: +1 734 786 8423 x121
fax : +1 866 888 3112
cell : +1 734 612 4615
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